add logging and database migration

app/migrate.py

@@ -0,0 +1,84 @@
+import sqlite3
+from version import __version__
+from pathlib import Path
+import logging
+from logging_config import setup_logging
+import os
+
+APP_ENV = os.environ.get("APP_ENV", "dev")
+logger = setup_logging(APP_ENV)
+
+logger.info(f"Starting migration - APP-Version {__version__}")
+
+logger = logging.getLogger(__name__)
+
+
+BASE_DIR = Path(__file__).resolve().parents[1]
+DB_DIR = BASE_DIR / "data"
+DB_PATH = DB_DIR / "app.db"
+MIGRATIONS_DIR = BASE_DIR / "migrations"
+
+
+
+def get_connection() -> sqlite3.Connection:
+    DB_DIR.mkdir(exist_ok=True)
+    conn = sqlite3.connect(DB_PATH)
+    return conn
+
+def get_applied_versions(conn: sqlite3.Connection) -> set[str]:
+    """
+    Ließt aus schema_version, welche Migrationen schon gelaufen sind.
+    Falls die Tabelle noch nicht existiert → leeres Set.
+    """
+    try:
+        cur = conn.execute("SELECT version FROM schema_version")
+        rows = cur.fetchall()
+        return {r[0] for r in rows}
+    except sqlite3.OperationalError:
+        # Tabelle existiert noch nicht (z.B. bei initialer DB)
+        
+        return set()
+
+def apply_migrations():
+    if not MIGRATIONS_DIR.exists():
+        raise SystemExit(f"Migrations-Ordner nicht gefunden: {MIGRATIONS_DIR}")
+
+    conn = get_connection()
+
+    try:
+        applied = get_applied_versions(conn)
+
+        # Alle .sql-Dateien alphabetisch sortiert
+        sql_files = sorted(MIGRATIONS_DIR.glob("*.sql"))
+
+        if not sql_files:
+            logger.info("Keine Migrationsdateien gefunden.")
+            return
+
+        for path in sql_files:
+            version = path.stem  # z.B. '20250220_120000_initial'
+
+            if version in applied:
+                logger.info(f"[SKIP] {version} (bereits angewendet)")
+                continue
+
+            logger.info(f"[APPLY] {version}")
+            sql = path.read_text(encoding="utf-8")
+
+            try:
+                # Eine Transaktion pro Datei
+                with conn:
+                    conn.executescript(sql)
+            except Exception as e:
+                logger.info(f"Fehler in Migration {version}: {e}")
+                # hier nicht weiter machen
+                raise
+        logger.info(f"Migrationen abgeschlossen. DB: {DB_PATH}")
+        #print(f"Migrationen abgeschlossen. DB: {DB_PATH}")
+
+    finally:
+        conn.close()
+
+
+if __name__ == "__main__":
+    apply_migrations()